Tamron SP 45 mm f/1.8 Di VC USD review - Coma, astigmatism and bokeh

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Tamron SP 45 mm f/1.8 Di VC USD

13 October 2015

Arkadiusz Olech

7. Coma, astigmatism and bokeh

Coma is another category where the Tamron outperforms older 50 mm constructions. Coma was a real pain for the old standard lenses but if you attach the new Tamron to an APS-C camera you won’t see it at all. The only chance to notice it you get in the corner of full frame at the maximum relative aperture where the image of the diode is slightly disfigured. Still that problem disappears completely after stopping down the lens by 1 EV.

Center, f/1.8	Corner APS-C, f/1.8	Corner FF, f/1.8

Center, f/2.5	Corner APS-C, f/2.5	Corner FF, f/2.5

The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 4.3% so was slight. In fact there are chances to perceive it at all only by f/1.8.

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Out-of-focus circles of light generated by the Tamron look good, without any light rims, gradients or conspicuous local extremes. If you wanted to carp about something you can mention delicate ‘onion rings’ of the bokeh.

Center, f/1.8	Corner APS-C, f/1.8	Corner FF, f/1.8

Center, f/2.5	Corner APS-C, f/2.5	Corner FF, f/2.5

Center, f/3.5	Corner APS-C, f/3.5	Corner FF, f/3.5